Catchments
| Name | Type |
|---|---|
| Abanto y Ciérvana-Abanto Zierbena (48002) | administrative |
| Abarán (30002) | administrative |
| Abarca de Campos (34001) | administrative |
| Abárzuza / Abartzuza (31002) | administrative |
| Abaurregaina / Abaurrea Alta (31003) | administrative |
| Abaurrepea / Abaurrea Baja (31004) | administrative |
| Abbadia Cerreto (098001) | administrative |
| Abbadia Lariana (097001) | administrative |
| Abbadia San Salvatore (052001) | administrative |
| Abbasanta (095001) | administrative |
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